Fluid fuel burner



Aug. 7, 1934. P. D. SHOENBERGER FLUID FUEL BURNER Filed Oct. 18, 1932 INVENTOR m m wB M M m Patented Aug. 7, 1934 TBS m sea rum) riparian 1 7 i Philip P. Shoenberger, Oaklzmmflalif, H -Application October 1s, 19-32,.SerialNol 638319 4 5 ims.- "(01, 1581-) assembled and to provide a'burner in'whi'ch the fuel and air for combustion may be quickly and thoroughly mixed to obtain a concentrated, intense flame. I 1

The various features of the invention are illustrated in the accompanying drawing, in which Fig. 1 is a longitudinal view, partly in section, of a burner embodying a preferred form of my invention;

Fig. 2 is an end View of the burner;

Fig. 3 is a side view of a nozzle pipe forming part of the burner, and

Fig. 4 is a cross section of the burner taken on line 44 of Fig. 1.

In the preferred embodiment of the invention shown in the accompanying drawing, the burner comprises a fuel chamber 10 in a suitable casting 11, to which fuel gas may be supplied through a passage 12 from either a pipe 13 entering the back of the casting or from pipes 14 or 15 entering the side. Inlets not used are to be plugged. The passageway 12 preferably delivers to the chamber 10 at the side of the latter. Air for combustion, supplied under pressure from either of two pipes 16 one entering the back of the casting and the other entering the side, is delivered through a passage 18 through a rear wall of the chamber 10 and in alignment with a threaded outlet opening 19 in the front wall of the chamber.

The air supplied under pressure through the passage 18 does not mix in the chamber 10 with the fuel gas supplied thereto but enters an inner or air nozzle pipe 20' which has one end 21 enlarged and shaped to fit the edge of the passage 13 and extends through the chamber 10 and outlet opening 19 and projects forwardly of the casting 11. The gas-supplied through the passage 12 is received in an annular compartment 22 formed in the chamber 10 about the pipe 20. The outlet opening 19 is of larger diameter than the outside diameter of the inner pipe 20 thereby forming an annular outlet opening from the chamber 10. An outlet nozzle pipe 23 is threaded into the outlet 19 and is sufiiciently larger in diameter to form with the inner pipe 20 an annular outlet gas passage 24.

The gas passage 24 1s constricted at its outer end by an enlargement 25 of the inner" pipe 20 which is thickened gradually froi'nits deliver-yend, tofprovide a tapering, outer surface, and by a tapering orcurving of the delivery end of the outer nozzle-toward the tapered end of the inner'nozzle; The outer tapered end of the outer or gas nozzle is slit longitudinally" from itsdelivery endto form'a peripheral seriesof spaced lon-' gitudihalslots26through which the gas issues in such manner as to mix immediately with the surrounding air. are: immediately drawn issuing from the-innerpipe29- which creates -aforward inward suction about the end of the nozzle. I

The width of the slots 26 may be varied somewhat by threading the nozzle 23 into the opening 19 to a greater or less degree thereby to spring the areas between the slots to a greater or less degree against the tapered area ofthe pipe 20 and widen the slots or permit them to contract.

Projections 27 may be formed on the inner surface of the tapered end area of the outer nozzle 23 so as to space the latter from the inner nozzle thereby forming narrow converging passageways 28 for a part of the gas stream. To prevent the flame from being blown out, spaced pilot openings 29 are provided back of the slots 26 through which small pilot jets of gas may issue. Some of the openings 29 may be placed in an annular groove 30. i

The above invention provides a burner of great simplicity, only three parts being required. It may be taken apart by merely unscrewing the nozzle 23 from the opening 19, whereupon the inner pipe 20 which is' merely placed against the outlet of the. passage 18 may be easily removed. Access to all of the passages is then easily available. The burner may be readily assembled by placing the inner pipe .20 in position and threading the end of the nozzle. 23 into the opening 19. The action of the air jet from the air pipe 20 combined with the preparatory mixing of the gas about the burner tip with the surrounding air 13 capable of causing a very quick and thorough mixing and a sharp intense flame to be attained. The sharpness and intensity of the flame may be controlled by controlling the air and gas supply.

Having described my invention, what claim is: I

1. A fluid fuel burner comprising a chamber having an outlet, an air inlet aligned with said outlet and a gas inlet, .an air nozzle extending from said air inlet through said chamber and The gas and surrounding air.

forwardly into the air jet said outlet and spaced therefrom to form a surrounding gas passage and projecting from said outlet and having an outwardly projecting enlargement tapered to its outlet end, a gas nozzle threaded into said outlet and spaced from said air nozzle to form an annular gas passage, the outer end of said gas nozzle being turned toward the tapering area of said enlargement to contract said gas passage slits. h '2. A fluid fuel burner comprising a chamber having an outlet, an air inlet aligned with said and having longitudinal outlet outlet and a gas inlet, an air nozzle extending from said air inlet through said chamber and said I the gas nozzle.

outlet and spaced therefrom to form asurroun'ding gas passage and projecting from said outlet and a gas nozzle threaded into said outlet and spaced from said air nozzle to form' an annular gas passage, the outer end of said gas, nozzle being turned toward said air nozzle to contract said gas passage'and having'longitudinal outlet slits and having spacer pins between said slit part of said gas nozzle and. said air nozzle. is v ;3.-A fluid fuel burner comprising a chamber having an outlet, an air inlet aligned with said outlet and a gas inlet, an air nozzle extending from said air inlet through said chamber and said outlet and spaced therefrom to form a surround ing gas passage and projecting from said outlet and a gas nozzle threaded into said outlet and spaced from saidair nozzle to form an annular gas passage, the'outer end ofsaid gas nozzle being turned toward said air nozzle to contract said gas passage and having longitudinal outlet slits, said gas nozzle having pil'otopenings back of saidslit area.

' V slits, said air nozzle being unsecured in said cham- 'ber and held in position therein by being confined between the air inlet and the taper of 5. Afluid fuel burner comprising a chamber having an outlet, an air inlet aligned with said outlet and -a gas inlet, an air nozzle extending from said air inlet through said chamber and said outlet and spaced therefrom to form a surrounding gas passage and projecting from said outlet, the outer surface'of the projecting endof said nozzle being contracted toward said end, and a gas nozzle threaded into said, outlet and spaced from said air nozzle to form an annular gas passage, the outer end of said gas nozzle bein turned toward said air nozzle to contract said gas passage, saidair nozzle being unsecured, in said chamber and spacing projections between said fuel nozzle and the contracted surface of the air nozzle and spaced about the latter at a distance from the exit end thereof and bearing against the contracted end of said air nozzle to,

hold the latter in position against said air inlet.

PHILIP D. SHOENBERGER.

CERTIFICATE OF CORRECTION.

Patent No. 1,969,157. August 7, 1934.

ii is hereby certified that the name of the inventor in the heaing to the printed specification of the above numbered patent was erroneously printed as "Philip P. Shoenberger" whereas said name should have been printed as Philip .A D. Shoenberger, as shown by the records of .the case in this office; and that-the '(Seai) said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 2nd day of October, A. D. 1934.

Leslie Frazer Acting Commissioner of Patents. 

